Rand Paul versus Barack H. Obama.
That's the name of a lawsuit filed Wednesday by the Republican senator against the President of the United States and other national security officials.
In a class action suit, Senator Paul says he's trying to stop the National Security Agency's gathering of telephone metadata.
He isn't the first to file suit against a sitting president and not the first to sue over this surveillance program.
But he is certainly one of the most recognizable names to do so.
CNN's Dana Bash reports OutFront.